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Journals

Semiclassical fifth virial coefficients for improved ab initio helium-4 standards

February 15, 2012

Author(s)

Katherine Shaul, Andrew Schultz, David A. Kofke, Michael R. Moldover

For helium-4, we present ab initio, semi-classical calculations of virial coefficients Bn for for n = 2, 3, 4, and 5 from 50 K to 1000 K. Using our values of B4...

Quantum state preparation and control of single molecular ions

February 14, 2012

Author(s)

Dietrich G. Leibfried

Preparing molecules at rest and in a highly pure electronic, rotational and vibrational quantum state is a long standing dream in chemistry and physics, so far...

Quantitative Measurements of the Size Scaling of Linear and Circular DNA in Nanofluidic Slitlike Confinement

February 14, 2012

Author(s)

Elizabeth A. Strychalski, Jon C. Geist, Michael Gaitan, Laurie E. Locascio, Samuel M. Stavis

Quantitative size measurements of single linear and circular DNA molecules in nanofluidic slitlike confinement are reported. A novel experimental method using...

Monitoring of Biofilm Formation on Different Material Surfaces of Medical Devices using Hyperspectral Imaging Method

February 14, 2012

Author(s)

Jeeseong Hwang, Do-Hyun Kim, Moon S. Kim

Contamination of the inner surface of indwelling (implanted) medical devices by microbial biofilm is a serious problem. Some microbial bacteria such as...

Towards a Metric for Communication Network Vulnerability to Attacks: A Game Theoretic Approach

February 13, 2012

Author(s)

Assane Gueye, Vladimir V. Marbukh

In this paper, we propose a quantification of the vulnerability of a communication network when links are subject to failures due to the actions of a strategic...

Microfluidic magnetophoretic separations of immunomagnetically labeled rare mammalian cells

February 13, 2012

Author(s)

Thomas P. Forbes, Samuel P. Forry

Immunomagnetic isolation and magnetophoresis in microfluidics have emerged as viable techniques for the separation, fractionation, and enrichment of rare cells...

Demonstration of code-division multiplexing for x-ray microcalorimeters

February 13, 2012

Author(s)

Greg Stiehl, W.Bertrand (Randy) Doriese, Gene C. Hilton, Kent D. Irwin, Carl D. Reintsema, Dan Schmidt, Daniel Swetz, Joel Ullom, Leila R. Vale, Joseph Fowler

We demonstrate the code-division multiplexing (CDM) readout of eight transition-edge sensor microcalorimeters. The energy resolution is 3.0 eV (full width at...

Anharmonic Phonons and Magnons in BiFeO₃

February 13, 2012

Author(s)

O. Delaire, M. B. Stone, J. Ma, A. Huq, D. Gout, Craig Brown, K. F. Wang, Z. F. Ren

The phonon density of states (DOS) and magnetic excitation spectrum of polycrystalline BiFeO 3 were measured for temperatures 200 less than or equal to}Τ less...

Advanced Code-Division Multiplexers for Superconducting Detector Arrays

February 11, 2012

Author(s)

Kent D. Irwin, Hsiao-Mei Cho, William B. Doriese, Joseph W. Fowler, Gene C. Hilton, Michael D. Niemack, Carl D. Reintsema, Daniel R. Schmidt, Joel N. Ullom, Leila R. Vale

Multiplexers based on the modulation of superconducting quantum interference devices are now regularly used in multi-kilopixel arrays of superconducting...

Mechanically Compliant Grating Reflectors for Optomechanics

February 10, 2012

Author(s)

Utku Kemiktarak, Michael Metcalfe, Mathieu Durand, John R. Lawall

We demonstrate micromechanical reflectors with a reflectivity as large as 99.4% and a mechanical quality factor Q as large as 7.8 x 10^5 for optomechanical...

Determination of spin pumping as a source of linewidth sputtered Co₉₀Fe₁₀/Pd multilayers by use of broadband ferromagnetic resonance spectroscopy

February 10, 2012

Author(s)

Justin M. Shaw, Hans T. Nembach, Thomas J. Silva

We performed a systematic study of damping in Co 90Fe 10/Pd multilayers by use of broadband (1 60 GHz) ferromagnetic resonance (FMR) spectroscopy in the...

Density, Speed of Sound, and Viscosity Measurements of Reference Materials for Biofuels

February 10, 2012

Author(s)

Arno R. Laesecke, Tara J. Fortin, Jolene D. Splett

Measurements of density, speed of sound, and viscosity have been carried out on liquid standard reference materials for biofuels as a function of temperature at...

Formation and structure of 360 and 540 degree domain walls in thin magnetic stripes

February 10, 2012

Author(s)

Youngman Jang, Samuel R. Bowden, Mark Mascaro, John Unguris, Caroline Ross

360˚, 540˚ and other complex transverse domain walls have been created in narrow Co wires connected to injection pads by cycling a magnetic field perpendicular...

High signal-to-noise ratio laser technique for accurate measurements of spectral line parameters

February 9, 2012

Author(s)

A. Cygan, D Lisak, S. Wojtewicz, J. Domyslawska, Joseph T. Hodges, R.S. Trawinski, R. Ciurylo

We present a new cavity-enhanced technique for the precise measurement of absorption line shape and line position. This approach, which combines high-bandwidth...

A test method for monitoring changes during durability tests on building joint sealants

February 8, 2012

Author(s)

Christopher C. White, Donald L. Hunston, Kar T. Tan

The durability of building joint sealants is generally assessed using a descriptive methodology involving visual inspection for defects. It is widely known that...

Using Truncated Data Sets in Spherical Scanning Antenna Measurements

February 8, 2012

Author(s)

Ronald C. Wittmann, Carl F. Stubenrauch, Michael H. Francis

We discuss the mitigation of truncation errors in spherical scanning measurements. The main emphasis is the spherical harmonic representation of probe...

High Separation Capacity and Selectivity of C₂ Hydrocarbons over Methane within a Microporous Metal-Organic Framework at Room Temperature

February 8, 2012

Author(s)

Yabing He, Zhangjing Zhang, Shengchang Xiang, Hui Wu, Frank R. Franczek, Wei Zhou, Rajamani Krishna, Michael O'Keeffe, Banglin Chen

Low Energy Spin Dynamics in the Spin Ice, Ho₂Sn₂O₇

February 8, 2012

Author(s)

G. Ehlers, A. Huq, S. O. Diallo, C. Adriano, K. C. Rule, A. L. Cornelius, P. Fouquet, P. G. Pagliuso, Jason S. Gardner

The magnetic properties of Ho 2Sn 2O 7 have been investigated and compared to other spin ice compounds. Although the lattice has expanded by 3% relative to the...

Antibacterial and physical properties of calcium-phosphate and calcium-fluoride nanocomposites with chlorhexidine

February 6, 2012

Author(s)

Lei Cheng, Michael D. Weir, Hockin H. Xu, Alison M. Kraigsley, Nancy Lin, Sheng Lin-Gibson, Xuedong Zhou

Secondary caries limits the longevity of tooth restorations. The replacement of existing restorations accounts for 50-70% of all restorations. Replacement...

Overall and Local Movement Speeds During Fire Drill Evacuations in Buildings up to 31 Stories

February 4, 2012

Author(s)

Richard D. Peacock, Bryan L. Hoskins, Erica D. Kuligowski

Occupant descent down stairwells during building evacuations is typically described by measureable engineering variables such as stairwell geometry, speed...

Nanoscale structure measurements for polymer-fullerene photovoltaics

February 3, 2012

Author(s)

Dean M. DeLongchamp, Regis J. Kline, Andrew A. Herzing

This review covers methods to measure key aspects of nanoscale structure in organic photovoltaic devices based on polymer-fullerene bulk heterojunctions. The...

A High-Resolution Atlas of Uranium-Neon in the H Band

February 3, 2012

Author(s)

Scott A. Diddams, Stephen L. Redman, Gabriel G. Ycas, Ryan Terrien, Suvrath Mahadevan, Lawrence W. Ramsey, Chad F. Bender, Steve Osterman, Franklyn J. Quinlan, James E. Lawler, Gillian Nave

The rapid advance in near-infrared (NIR) detector technology in the past decade has lead to a number of high-resolution astronomical spectrometers that are...

Control of Molecular Mass Distributions in Enzymatic Lactone Polymerizations

February 2, 2012

Author(s)

Santanu S. Kundu, Peter M. Johnson, Kathryn L. Beers

Using a model developed for the enzyme catalyzed polymerization and degradation of poly(caprolactone), we illustrate methods and the kinetic mechanisms...

Bending manipulation and measurements of fracture strength of silicon and oxidized silicon nanowires by atomic force microscopy

February 2, 2012

Author(s)

Gheorghe NMN Stan, Sergiy Krylyuk, Albert Davydov, Robert F. Cook

In this work, the ultimate bending strengths of as-grown Si and fully oxidized Si nanowires were investigated by using a new atomic force microscopy (AFM)...

Antibacterial amorphous calcium phosphate nanocomposite with quaternary ammonium salt and silver nanoparticles

February 2, 2012

Author(s)

Nancy Lin, Lei Cheng, Michael D. Weir, Hockin H. Xu, Joseph M. Antonucci, Alison M. Kraigsley, Sheng Lin-Gibson, Xuedong Zhou

Objectives. Calcium and phosphate ion-releasing resin composites are promising for remineralization; however, so far there has been no report on imparting a...

Resonant control of polar molecules in an optical lattice

February 1, 2012

Author(s)

Thomas M. Hanna, Eite Tiesinga, William F. Mitchell, Paul S. Julienne

We study the resonant control of two nonreactive polar molecules in an optical lattice site, focussing on the example of RbCs. Collisional control can be...

Zn-MOF Assisted Dehydrogenation of Ammonia Borane: Enhanced Kinetics and Clean Hydrogen Generation

February 1, 2012

Author(s)

Gadipelli Srinivas, Jamie Ford, Wei Zhou, Taner Yildirim

We report controllable and enhanced hydrogen release kinetics at reduced temperatures in ammonia borane (AB) catalyzed by Zn-MOF-74. AB is loaded into the...

The Effect of Gravity on the Debye-Scherrer Ring in Small-Angle Neutron Scattering

February 1, 2012

Author(s)

David F. Mildner, R. Cubitt

A statistical study of de-embedding applied to eye diagram analysis

February 1, 2012

Author(s)

Paul D. Hale, Jeffrey A. Jargon, Chih-Ming Wang, Brett Grossman, Matthew Claudius, Jose Torres, Andrew M. Dienstfrey, Dylan F. Williams

We describe a stable method for calibrating digital waveforms and eye diagrams using the measurement system response function and its regularized inverse. The...

Influence of Particle Size Distributions on Yield Stress and Viscosity of Cement-Fly Ash Pastes

February 1, 2012

Author(s)

Dale P. Bentz, Chiara F. Ferraris, Michael A. Galler, John Guynn, Andrew Hansen

The rheological properties of blended cement-based materials depend strongly on mixture proportions and the characteristics of the components, such as cement...

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